This paper describes an electrode designed for pH measurements in the gastro-intestinal tract. Some of the problems concerned with in vivo pH measurements are discussed, and a direct recording of pH is shown from different parts of the duodenum. By means of a pH averaging analog computer, information can be obtained about mean pH and the percentage of time pH is below and above pre-set values.
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S. J. Rune (1968) studied this question.
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